Question

代码如下：

public class CarLoan {
    public static void main(String[] args) {
        int carloan = 10000;
        int loanlengh = 3;
        int interestrate = 5;
        int downpayment= 2000;
        if (loanlengh <= 0 || interestrate <= 0);   
        System.out.printl("no");
        else if (downpayment > carloan);
        System.out.printl("thats not how it works");

        else
            int remainingbalance = carloan -downpayment;
        int months = loanlengh * 12;
        int monthlybalance = remainingbalance / months;
        int interest = placeholder /100;
        int placeholder = (monthlybalance * interestrate);
        int monthlypayment = monthlybalance + interest;
        System.out.println(monthlypayment);
    }
}

以下是错误：

CarLoan.java:13：错误：此处不允许变量声明int剩余余额= carloan-首付；

我没收到问题。

已修复的错误：

CarLoan.java:9：错误：“ else”不带“ if” 否则（首付>贷款）；

Answer 1

问题出在您正在执行的if statement行中：

if (loanlengh <= 0 || interestrate <= 0);

请注意在末尾使用分号;。因此，if语句到此结束。如错误所述：

错误：“ else”不带“ if”

出现错误。

Answer 2

需要删除下面两行的;

if (loanlengh <= 0 || interestrate <= 0);   

else if (downpayment > carloan);

Answer 3

在;和if语句之后删除else if。并在{ }之后添加花括号else，以在else部分中包含所有必要的行。

if (loanlengh <= 0 || interestrate <= 0) // removed `;`
    System.out.printl("no");
else if (downpayment > carloan) // removed `;`
    System.out.printl("thats not how it works");
else { 
    ... // added curly braces `{ }`
}

您应该更好地格式化代码以避免此类错误。

并尝试始终将大括号{ }与if-else一起使用，会有所帮助。

if (loanlengh <= 0 || interestrate <= 0) {
    System.out.printl("no");
} else if (downpayment > carloan) {
    System.out.printl("thats not how it works");
} else {
    ...
}

Answer 4

if (loanlengh <= 0 || interestrate <= 0) // removed `;`
    System.out.printl("no");
else if (downpayment > carloan);
    System.out.printl("thats not how it works");

您已经在if语句的末尾添加了semicolon。

Answer 5

您的问题在第7、9行以及else语句中。删除第7行和第9行的;

在其他地方进行校正（此处是第12行），它将解决该问题。我已经测试过。

 else
       {int remainingbalance = carloan -downpayment;}

如果不能正确控制流量，则使用

if (condition){
 //statements here
}
else if (condition){
 //statements here
}
else {
//statements here
}

此处不允许使用变量声明。爪哇

5 个答案: